• Please note that there are a few updates and clarifications made in the Audiokarma Rules, mostly relating to advertising and the addition of the new "Paying it Forward" & "Giving back" forums in the AudioKarma Audio Marketplace section.

What are some good MOSFET amps?

How can we forget these power amps :scratch2:

Sumo Andromeda - 1981, 2x200W

Sumo Andromeda II - 1989, 2x200W

Sumo Andromeda III - 1993, 2x240W

Sumo Polaris - 1982, 2x100W

Sumo Polaris II - 1990, 2x120W

Sumo Polaris III - 1993, 2x120W

Sumo Ulysses - 1989, 2x60W

Sumo Ulysses II - 1993, 2x60W
 
Musical Fidelity Dr. Thomas 2x70W (early "shoe box" version) - 1 pair Hitachi 2SJ82/2SK225 (2SJ83/2SK226)

Musical Fidelity Dr. Thomas (later bigger 19" rack version) 2x120W - 2 pairs Hitachi 2SJ82/2SK225 (2SJ83/2SK226)

Musical Fidelity P170 2x85W - 1 pair Hitachi 2SJ82/2SK225

Musical Fidelity P270 2x135W - 3 pairs Hitachi 2SJ82/2SK225

Musical Fidelity P270/2 2x135W - 3 pairs of Hitachi 2SJ162/2SK1058 (not! as good as MK I)

Musical Fidelity A370 2x185W - 5 pairs of Hitachi 2SJ83/2SK226

Musical Fidelity B200 2x70W - 1 pair Hitachi 2SJ50/2SK135 (integrated version of P140)

Musical Fidelity P140 2x70W - 1 pair Hitachi 2SJ50/2SK135

Musical Fidelity P150 2x75W - 1 pair Hitachi 2SJ50/2SK135 (P140 with better transformer)

Musical Fidelity P180 2x80W - 5 pairs Hitachi 2SJ50/2SK135 (see picture)

mf_p180.jpg
 
HiFiDude said:
Hitachi MOSFET power amps has been listed :thmbsp:

But they did infact in 1979 also make a trio of integrated MOSFET amplifiers
Click to expand...

Those look very nice and then there's also the Hitachi MOSFET integrated 70 Watts rms HA-6800.

attachment.php
attachment.php
 
Last edited:
Looks very nice with use of heat pipe cooling :thmbsp: ...,
a shame they did change the concept away from dual mono power supply :tears:

top%2Bopen.jpg
 
OCM 500, not an amp in my possession, nor have i heard it, but oh my oh my worth reviving this thread for.

ocm500_face.jpg


100_3713-1.jpg
 
The Hafler DH-200/220 are nice MOSFET amps and easier to find in the US/Canada. Not many in the UE, unfortunately.
One can even modify/improve them with tested kits.

But nothing's better when one DIY his own MOSFET amp: put one or two pairs of K1058/J162 per channel, a good (better dual) power supply with various and smaller caps in parallel per bank and the job is done.

Class A or AB, your choice.
 
avionic said:
DIY :thmbsp: 2SK1058's/2SJ162's...:thmbsp: Hitachi Lateral MOSFET's
Thats what I did.And they sound excellent. Makes close to 250 wpc.(8 ohm)
load tested at 247wpc before clipping into 8 ohm load @ 1khz
http://sound.westhost.com/project101.htm
Click to expand...

This thread got resurected and I read it for the first time. avionic, I hope the link you show here is still a good one. I can't get to anything accept .org, .mil and .gov sites right now.

I'm going to check it out when my tour is up in another week and a half. I'm very interested in that amp design but will have to find out if the Hitachi MOSFET's are still readily available.
 
You must log in or register to reply here.
Back
Top Bottom